CAJ | 학술논문

　　为了更好的反映基坑开挖后土体的变形非线性特性，采用幂函数描述土体剪切过程中切线模量随主应力差值增大而衰减的过程。积分得到主应力差值和应变的数学表达式，其反映的数学规律符合一般土力学模型的要求。对应于不同的幂指数，该表达式可以很好拟合三轴试验应力-应变曲线。基于Duncan-Chang模型参数确定的方法，提出了本文模型参数的确定方法。在通用有限元软件基础上二次开发了模型的计算程序。应用于某基坑变形的计算结果表明，本文提出的模型比Duncan-Chang模型能更好的预测围护结构的变形。
　　위료경호적반영기갱개알후토체적변형비선성특성，채용멱함수묘술토체전절과정중절선모량수주응력차치증대이쇠감적과정。적분득도주응력차치화응변적수학표체식，기반영적수학규률부합일반토역학모형적요구。대응우불동적멱지수，해표체식가이흔호의합삼축시험응력-응변곡선。기우Duncan-Chang모형삼수학정적방법，제출료본문모형삼수적학정방법。재통용유한원연건기출상이차개발료모형적계산정서。응용우모기갱변형적계산결과표명，본문제출적모형비Duncan-Chang모형능경호적예측위호결구적변형。
To reflect well the nonlinear deformation character of soil during excavation, power function was em-ployed to describe the process of tangent modulus decay with the principal stress difference decreasing during the shearing process of soil. The mathematical expressions between principal stress difference and strain were attained by integration, which was consistent with the requirement of general soil model. The expressions with different power exponents could fit stress-strain curves of triaxial test. Based on the method defining by parameters of Dun-can-Chang model, the parameters of model were put forward. On the platform of a general finite element software the computing programs for the model were redeveloped, which was employed to precast deep excavation deformation. The results show the model proposed can predict better the enclosure deformation than Duncan-Chang model.